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That's putting your name in front of something, at least in part, in the hopes of receiving compensation...in your case good will, i.e. an asset of value to you.

The only difference between that and, say, Drucker's endorsement of LeBlanc clarinets for a time, an excellent maker of instruments, is his endorsement was likely more tangible and formal, (money and/or product contractually guaranteed.)

I don't have issue with either arrangement, but all else about your playing the product despite this, or its likely strong sales without your plug is moot.

Not everyone of your craftsman's clients will likely receive his best care and work product: an asset. You hope to exchange good will (a form of compensation) for it.